Dental instrument.



G. S. EDWARDS.

DENTAL INSTRUMENT.

APPLICATION PILED'SBPT. 1s, 191s.

Patented Apr. 7', 1914.

Swuewboz (3x-:nage 5 .EDWARDS cnLuMBlA PLANQGRAIH C0., WASHINGTON, D. c.

GEORGE S. EDWARDS, OF GREENASTLE, PENNSYLVANIA.

VDENTAL nvs'rRUivrnN'r.

Specification of Letters Patent.

Patented Apr. 7, 19ML.

Application filed September l?, 19.13. Serial No. 789,695.

To all whom it may concern.'

Be it known that l, GEORGE S. EDWARDS, a citizen of the United States, residing at Greencastle, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Dental Instruments, of which the following is a speciication reference being had to the accomc 7 a panying drawings.

This invention relates to new and useful Vith these and other objects in View, the

invention consists in't'he novel features of construction, combination and arrangement of parts as will be hereinafter referred to and more particularly pointed out in the specification and claims.

Inithe accompanying drawing forming a part of this'application, Figure 1 is a side elevation of the device. Fig. 2 is a longitudinal section therethrough. Fig. 3 is an enlarged transverse section through the same as seen on line 3 3, Fig. 2. Fig. L1 is a similar view as seen on line 4 4, Fig. 2.

In describing my invention, I shall refer to the drawing in which similar reference characters designate corresponding parts throughout the several views and in whichl indicates a barrel, the one end of which has an arcuate tubular portion 2 secured thereto, the bore of said arcuate portion being of somewhat restricted diameter and suitably engaged with the free end of the arcuatev portion 2,is arest-ricted tubular point 3 which forms the free and filling end of the device. A cap member 4: is provided and adapted for engagement with the outer end of the arcuate tubular member 2 to form-a cap i for the filling end ofthe device. The one end of the barrel l, adjacent the arcuate member 2 is designed to form a chamber for filling material, as indicated atr5, and slid ably mounted in said barrel, for the purpose `,of expelling the filling material from said chamber, is a plunger which consists of aA tubular member 6 and a removable solid end 7, the latter forming a head for the plunger and engaging the lling Vmaterial in the chamber. The opposite or inner end of the tubular member 6 of the plunger is internally threaded, as shown at 8, and engaged with this threaded end, is a feed screw 9, the one end of which, disposed within said tubular member 6, is enlarged, as shown at 10 to form a stop for the feed screw. The opposite end of the feed screw 9 is suitably engaged with an enlarged head 11 which has a casing-like member 12 formed thereon to slidably receive the inner end of the barrel 1 therein.

y Secured on the barrel 1, at a predetermined point thereon, is a tubular-lile casing 13 which is enlarged at one end thereof to form a bowl-like head 14, the bottom of which has a pair of depressions 15 formed therein at substantially diametrically opposite points thereon. Mounted to rotate on the barrel 1, within the head member 14, is a disk 16, the same being secured to an enlarged head-like portion of a tubular member 17. This tubular member 17 is rotatably mounted on the barrel 1 and forms substantially a continuation of the tubular member 13 and a spring-forced pawl 18 is carried by the disk member 16 and adapted for engagement with the depressions in the base or bottom of the member 14, whereby to serve as an indicator to the operator. When turning the tubular portion 17, as will be described hereinafter, it will be understood that these stops, which are engagements of the pawls with the depressions, will be readily f-elt by the operator.

The free end of the casingslike member 12, formed on the head 11, has the bore thereof enlarged to receive therein the one end of the tubular member 17 and this end of the tubular member 17 is provided with a slot 19 which receives therein an inwardly extending lug 20 carried on the free end of the member 12. A collar 21 is secured on the barrel 1, to contact with the one end of the tubular member 17, whereby to prevent sliding movement of the latter on the barrel and said collar is also received in the enlarged end of the member 12. This collar also forms a stop to limit the outward movement of the member 12 with respect to the member 17. It will be seen from this construction that by turning the head member 11, the member 17 will be correspondingly turned therewitlnas will also be the disklike member 16 carried by said member 17.

I have provided a means to prevent the rotation of the disk member 16 in one direction and, to this end, the peripheral edge of said disk memberis'oifset or cut-away at predetermined points therein, as shown at 92 such offsetting providiiig'a shoulder 23 and an inclined vwall 24 at each cut-away port-ion. Arranged in each of these offsets to contact with the inclined wall 22 thereof,

is a roller 25 and suitably mounted in the wall of each shoulder 23, is a spring-forced bolt 26, the head of the latter contacting with the roller 25. The normal tendency of these spring-forced bolts 26, acting on the rollers 25, is to force said rollers outwardly in the offset portions 16 into contact with` inclined walls 24 and the inner peripheralj wall of the member 14 and thus positively prevent the rotation of said member 1,6.

The purpose of providing such a construction for the prevention of the rotation of the member 16 in one direction, appears obvious.

y In practice, the chamber 5 of the barrel 1 is filled with the filling material used by dentists and the device is retained in this condition until such time when it is desired to use the same. At such time, the cap member 4 is removed from the outer or lling end of the device and the operator, holding the device by the member 13, which is rigidly i held on the'barrel 1, turns the head member 11'so that the member 17 will be turned a predetermined distance. This member 17 may be rotated a predetermined distance and l this distance is calculated by the engagement of the pawl 18 with the notches or depressions 15 in the bottoni of the member 14. By j this turning action, it is obvious that the feed screw 9 will be withdrawn from the tubular portion 6 of the plunger to a pre determined distance, it being understood that this tubular portion of the plunger will be held stationary in the barrel 1, in viewl of the friction between the head member 7.

Vand the inner wall of said barrel. By such turning action,`tl ie h ead member 11 is drawn g outwardly, whereupon said head member, I

with the plunger is then forced inwardly and with the inward forcing of the head member and rplunger, av predetermined amount of filling material is expelled from thechamber 5, through the restricted end of the device. This material may be forced into .the canal of the root of a tooth and when so done, the device .may vbe set aside and kept in this condition until desired for further use.

From the foregoing description ofthe Vconstruction of my improvedv device,v the operation thereof will be readily understood and it will be seen that I have provided a device which is simple and durable iii construction, inexpensive to manufacture and one which will be veryeflicient and useful in operation.

' WhileI have particularly described the elements best adapted to'perform the functions set forth, it is obviousthat various changes in form,A proportion and in the minor details of construction maybeV rre-V sorted to without departing from the spirit or sacrificing any of Vthe principles of the invention. Y Y 'I Y Having thus described this invention, what is claimed is z- Y 1. A dental instrument ofthe class Vde soV scribed-comprising a barrel, an Varcuate tubular member connected to one end thereof and having a restricted bore, a plunger mounted for reciprocation in said barrel, a feed screw Y engaged with one end of said plunger and having a head on the outer end thereof f adapted to conta-ct with the opposite end of said barrel, and means in connection with the head on said feed screw and the barrel to i limit the stroke of said plunger in the barrel.

2. In a dental instrument of the class described, a barrel, a tubular arcuate member connected to one end thereof and'having a restricted bore, a plunger mounted for reciprocation in said barrel, a feed screw engaged with one end of said plunger within the barrel, a head carried on the outer end of said feed screw adapted for engagement with the opposite end of said barrel, and means in connection with the head of said feed screw for calculating the adjustment of the latter and correspondingly limit the stroke of said plunger.

3. In a dental instrument of theclass described, a barrel, la tubular member of arcu-V ate design having a restricted'bore connected fto one end of said barrel, a plunger reciprocally mounted in said barrel, a feed screw connected to said plunger` and having a head on the outer end thereof adapted forV engagement with the opposite end of said barrel, a

member rotatably mounted on saidbarrel and engaged with said head to rotate'with izo the latter, said hea-d member being so' connected withsaid member as tomove longitu-V dinally of the latter, andy means in connec- Y tion with said. rotatable memberfor Ycalculating theadjustment Ofthefee'd screw. v Y,

4. In a dental instrument of the dass described,a barrel, Van arcuate tubular meinber-` connected to one of said barrel and havi Y ing a restricted bore, akplungerA mounted'for reciprooation in the barrel, a feed screw en* gaged with said plunger, a head member mounted onthe outer end of said feed screw adapted to Contact with the opposite end of said barrel, a bowl-shaped head member rigidly mounted on the barrel and having depressions in the base thereof, a member rotatably mounted on the barrel and having a portion thereof received in said head member, a spring-held pawl carried by said rota` table member and adapted for engagement with the depressions in the base of said `head member, and means for the engagement of said head member With said rotatable member to cause the latter to ,be rotated With the former and simultaneously admit of longitudinal movement of the former with respect to the latter.

5. In a dental instrument, a barrel, an arcuate tubular member connected to one end thereof and having a restricted bore, a plun` ger mounted for reciprooation in said barrel, a feed screw engaged With said plunger, a head member carried on the outer end of said feed screw and adapted to engage the opposite end of said barrel7 a tubular-like casing formed on said head member and reoeiving the last mentioned end of said barrel therein, the extreme free end of said tubular easing having the bore thereof slightly enlarged, a member rotatably mounted on said barrel, and received in the enlarged bore of said casing, means connecting said casing With the rotatable member to cause the latter to be rotated with the former and simultaneously permit longitudinal movement of the former with respect to the latter, a bowl-shaped member rigidly carried on said barrel and having depressions in the base thereof, said bowl-shaped member be` ing adapted to receive a portion of said rotatable member therein, a spring held pawl carried by said rotatable member and adapt ed to be received in the depressions of the bowl-shaped member, and means to prevent the rotation of said rotatable member in one direction.

In testimony whereof I hereunto aiix my signature in the presence of tWo Witnesses.

GEORGE S. EDVARD S.

Witnesses:

Crus. B. CARL, WM. R. DENIsoN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, ID. C. 

